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Open AccessArticle

Interface Bond Improvement of Sisal Fibre Reinforced Polylactide Composites with Added Epoxy Oligomer

by Mingyang Hao 1,2, Hongwu Wu 1,2,*, Feng Qiu 1,2 and Xiwen Wang 1
1
The Key Laboratory of Polymer Processing Engineering of Ministry of Education, South China University of Technology, Guangzhou 510640, China
2
National Engineering Research Center of Novel Equipment for Polymer Processing, South China University of Technology, Guangzhou 510640, China
*
Author to whom correspondence should be addressed.
Materials 2018, 11(3), 398; https://doi.org/10.3390/ma11030398
Received: 31 January 2018 / Revised: 14 February 2018 / Accepted: 2 March 2018 / Published: 7 March 2018
(This article belongs to the Section Advanced Composites)
To improve the interfacial bonding of sisal fiber-reinforced polylactide biocomposites, polylactide (PLA) and sisal fibers (SF) were melt-blended to fabricate bio-based composites via in situ reactive interfacial compatibilization with addition of a commercial grade epoxy-functionalized oligomer Joncryl ADR@-4368 (ADR). The FTIR (Fourier Transform infrared spectroscopy) analysis and SEM (scanning electron microscope) characterization demonstrated that the PLA molecular chain was bonded to the fiber surface and the epoxy-functionalized oligomer played a hinge-like role between the sisal fibers and the PLA matrix, which resulted in improved interfacial adhesion between the fibers and the PLA matrix. The interfacial reaction and microstructures of composites were further investigated by thermal and rheological analyses, which indicated that the mobility of the PLA molecular chain in composites was restricted because of the introduction of the ADR oligomer, which in turn reflected the improved interfacial interaction between SF and the PLA matrix. These results were further justified with the calculation of activation energies of glass transition relaxation (∆Ea) by dynamic mechanical analysis. The mechanical properties of PLA/SF composites were simultaneously reinforced and toughened with the addition of ADR oligomer. The interfacial interaction and structure–properties relationship of the composites are the key points of this study. View Full-Text
Keywords: polymer-matrix composites; natural fiber reinforcement; interface/interphase; microstructural analysis; crystallization behavior; rheological behavior polymer-matrix composites; natural fiber reinforcement; interface/interphase; microstructural analysis; crystallization behavior; rheological behavior
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Hao, M.; Wu, H.; Qiu, F.; Wang, X. Interface Bond Improvement of Sisal Fibre Reinforced Polylactide Composites with Added Epoxy Oligomer. Materials 2018, 11, 398.

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